fix_filename_slashes - Converts all the directory separators to a standard
character. Allegro game programming library.
char *fix_filename_slashes(char *path);
Converts all the directory separators in the filename stored in `path' to a
standard character. On DOS and Windows platforms, this is a backslash. On most
other platforms this is a slash. Example:
char buf = "c:/dos\\backup/weirdo\\test";
/* Under DOS we would have c:\dos\backup\weirdo\test.
Under Unix we would have c:/dos/backup/weirdo/test. */
Returns a copy of the `path' parameter.